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发明名称
Earth drilling machine
摘要
申请公布号
US2394194(A)
申请公布日期
1946.02.05
申请号
US19440530982
申请日期
1944.04.14
申请人
THE SALEM TOOL COMPANY
发明人
MCCARTHY VINCENT J.
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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